The energy transition is one of the most significant projects in the context of climate protection and sustainable development. It describes the shift from a fossil-fuel-based, CO₂-intensive energy supply to a system based on renewable energies. In Germany, the energy transition has been politically and socially accelerated to reduce CO₂ emissions, decrease dependence on fossil fuels, and convert the energy supply to environmentally friendly, renewable sources such as wind, solar, and biomass. This article will tell you more about the most important milestones of the energy transition that have already been achieved and the challenges that still lie ahead.
1. The decision on the energy transition (2010)
The first major milestone in the energy transition was reached in 2010 when the German Federal Government, under the leadership of Chancellor Angela Merkel, adopted the “Energy Concept 2020.” This concept established the fundamental goals of the energy transition, including a drastic reduction in CO₂ emissions and a significant increase in the share of renewable energies in the energy mix. A target of 35% renewable energy in the electricity sector by 2020 and 80% by 2050 was set.
2. Nuclear phase-out (2011)
Following the Fukushima nuclear disaster in Japan in 2011, the German government decided to phase out nuclear power. In a historic move, the nuclear phase-out was mandated, meaning that all nuclear power plants in Germany were to be shut down by 2022 at the latest. This decision marked a decisive turning point in German energy policy and placed a stronger focus on expanding renewable energies to fill the gap created by the nuclear phase-out.
3. Renewable Energy Sources Act (EEG) and expansion of solar energy (2000–2010)
The Renewable Energy Sources Act (EEG) was first passed in 2000 and laid the foundation for the massive expansion of renewable energies in Germany. Solar energy, in particular, benefited from the attractive feed-in tariffs stipulated in the EEG. These tariffs enabled solar companies and private individuals to invest in photovoltaic systems and feed surplus electricity into the grid. The expansion of solar energy in the following years led to enormous growth in the sector and made Germany a world-leading market for solar power.
4. Coal phase-out (2021)
Another milestone in the energy transition is the phase-out of coal. In 2021, the Coal Phase-Out Act stipulated that all coal-fired power plants in Germany must be shut down by 2038 at the latest. The coal phase-out presents a major challenge, as coal-fired power plants have played a significant role in Germany's energy supply. However, the phase-out is crucial for achieving climate targets, since coal-fired power plants are among the largest CO₂ emitters. To ensure that the phase-out is socially and economically sustainable, measures have been established to support the affected regions and the workers in the coal sector.
5. Expansion of wind energy (since 2000)
A key component of the energy transition is the expansion of wind power. Germany is now among the leading countries in the use of wind energy, both onshore and offshore. Wind energy has established itself as one of the most important sources of renewable energy in Germany and makes a significant contribution to reducing the demand for electricity from fossil fuels. The expansion of wind power will continue to be driven forward in the coming years, with the aim of significantly increasing the share of wind energy in the German electricity mix.
6. Decarbonization of industry (2020s)
Another key aspect of the energy transition is the decarbonization of industry. Germany has set itself the goal of making even the industrial sectors that traditionally cause high CO₂ emissions more climate-friendly. This is to be achieved through the use of innovative technologies such as hydrogen, carbon capture and storage (CCS), and improvements in energy efficiency. The transition to a climate-neutral industry is one of the greatest challenges of the energy transition, as many industrial processes are still heavily reliant on fossil fuels.
7. Climate neutrality by 2045
The most ambitious milestone of Germany's energy transition is the goal of achieving climate neutrality by 2045. This means that Germany aims to reduce its CO₂ emissions to zero by that date by converting all sectors – from energy supply and transport to industry – to renewable energies and climate-friendly technologies. This is a long-term goal that will require many profound changes in the German economy and society.
Conclusion: The energy transition as an ongoing process
Germany's energy transition is an ongoing process aimed at a long-term transformation of the entire energy system. With the milestones already achieved – from the nuclear phase-out and coal phase-out to the promotion of renewable energies – Germany has set a clear course towards a climate-friendly, sustainable energy future. However, many challenges remain, particularly in the decarbonization of industry and the transition to a climate-neutral economy. The energy transition requires not only technological innovations but also political and societal decisions that pave the way for a sustainable future.
This existing glossary article was reviewed and approved on 14 October 2026. Time-sensitive information still refers to its original publication context unless the article states otherwise. It does not replace installation instructions or confirm compatibility with a particular roof tile model.
Machine-assisted translation. The German version remains available.
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